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(No Model.)

L. METTE &-P.'KR1Z1K ELECTRIC LAMP.

Patented Feb. 5,1884.

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(No Model.) f 2 sheets-sheet 2.

VL. PIETTE 85 P. KRIZIK.

ELECTRIC LAMP.

Patented Feb. 5', 1884.

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LDVIG lll'lTl AND FRANZ KRIZIK, OF l LSDX, AUS"RIA-HUNGARX ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 293,076, dated February 5, 1684. Application tiled July l, 1552. (No model.) Patented in Belgium June G, 1882, No. 58,118; in France June T, 1SS2,X0.11U,13S;

in England June 0 185:2 'No Q 'T1-2 and in Germany June 11, 1

To @ZZ wwnt it may concern.-

Be it known that we, LUDwio Pin'r'rn and FRAM Knrziit, subjects of the Emperor of Austria-Hungary, and residents of Pilsen, in the Empire otA Austria-Hungary, have invented a certain Improvement in Electric Lamps, ot which the following is a specification.

rIhis invention relates to an improved method of effecting automatically the regulation ofthe distance of the carbons in an electric lamp, without the aid of clockwork or other like mechanism ,by the use oi a solenoid orsolenoids having a tapering iron core.

Vith reference to the accompanying drawings, Figures l and 2 illustrate the principle of the present invention, and Figs. 8 and 4 show an electric lamp constructed according to the present invention. Supposing the tapering or conical iron rod A to be surrounded by a current, B, and supposing the rod A to be free to slide lengthwise within this electric circuit, then the electric current would cause the said rod to move until the thick end is drawn within the said circuit, as in the thicker end there are more molecules to be attracted than in the pointed end. Snpposing, as shown in Fig. 2, the limits of attraction of the electric circuit to be C D, then all the molecules lying between these limits will be attracted, and the rod will be moved lengthwise by a force proportionate to the variation in its thicknesses. If, instead of the simple circuit shown in Figs. l and 2, a solenoid-coil is used, the action will be increased. Figs. 3 and i show an electric-are lamp, and Fig. 5 a diagram of the circuits thereof, constructed according to the invention, with a tapering iron core arranged within two solenoids, Z and Y, ot' a peculiar construction.

lt It are two pulleys, over which two cords run, carrying a brass tube containing the tapering iron core S. To the other ends of the cords the frame A B C D is attached, so that the iron core S and the'i'rame AB C D nearly balance each other. The brass tube carries the upper positive carbon, while the frame A B C D carries the negative carbon. rlhe weight of the frame A B C D is so regulated that it is somewhat less than that of the brass tube with the iron core, so that the latter will, by its overweight, have the tendencyto keep the carbons in contact until a current passes through the solenoid-coil.

For the purpose of guiding the brass tube,

as well as the i'rame AB C D, in a straight direction, the rollers o' are used. Willen a current circulates through the lamp, it can take the following course, viz: throughthe positive (et) terminal orpost, pulleys R t', brass tube S, carbon K, voltaic-arc frame A B C D, guidepulleys r r, into the whole framing of the lamp, isolated coil Z, of thick wire,to the negative terminal or post. Almost the entire current takes this course, and has the tendency to raise the iron core S, and thus to separate the carbons. This takes place only when the attraction ofthe solenoid-coil is greater than the overweight ot' the iron rod S balancing the frame A B C D. W'hen this is the ease, the iron core is attracted until the weakening' ol" the current, caused by the formation ot'ihe voltaic arc, reaches such a degree that the attractive force and the said overweight counterbalance each other. It', in the course ofthe consumption ot' the carbons, the current decreases still more in intensity, then the overweight ot' the rod S will overcome the attractive torce of the coil Z, and if the difference is large enough to overcome the friction and the like, then the carbons will approach each other. In this manner these two forces constantly balance each other and regulate the proper distance of the two carbons from each other.

For the purpose ot increasing the delicacy of the adjustment, the main solenoid-coil Z is covered by a second solenoid, Y, of high resistance, by which the effect of the iii-st one is weakened, and that in the same ratio as the main current is weakened by the increase ot' the voltaie are. These two solenoids Z an'dtT are not wound uniformly 5 but the number of layers is decreased stepwise,as represented in Fig. d, in such a manner that the two solenoids together form a single cylinder. By this arrangement the object in view is attained in a better and more reliable manner than if the two solenoids were wound cylindrically.

The rods nznz, carrying the guide-pulleys r yr for the frame A B C D, maybe made hollow, and in this case mercury may be introduced into them, and by means of wires,which would have to be suitably fixed tothe con- IOO necting-piccc of thc i'ramc A B, a better conwith the solenoid-core S, of the coils Y and Z, ducting connection for the passage of the cur- Wound one around the other, and tapered or rent froin the franic A B C D to thc framing graduated in opposite direct-ions, as shown and i 5 of the lamp may be attained. described.

XVe clain1- -In testimony whereof We have signed our 4 1. In an electricarc lamp, the combination, 11a-mcs to this specicat-ion in the presence ot' with the sliding,` solenoid-core S, of the sotwosubscribing;` witnesses.

lenoid-coils Y Z, Wound one around the other, LUDVIG PIETTE. the convolutions in each coil gradually inl FRANZ KRIZIK. to creasing toward one end, substantially as de- Vitnesses:

scribed. 4 C. O. PAGET,

-2. In an electric-arc lamp, the combination, i l. G. J. RODLER. 

